I feel ugly!

This is my second child, and I'm just not into it. I want this to be done with. I got into great shape after my first. Six pack, toned legs and all. Now I'm just getting fat, I've already gained like 20lbs and I'm only 15weeks..... I have no motivation to work out, I feel out of place at the gym I went to every day.... I don't know why! My husband tells me I'm beautiful every day, but I just want to tell him to shut up! I want this to be over with.....